@article{MZM_1997_62_1_a11,
     author = {Yu. A. Konyaev and Yu. S. Fedorov},
     title = {Asymptotic analysis of certain classes of singularly perturbed problems on the semiaxis},
     journal = {Matemati\v{c}eskie zametki},
     pages = {111--117},
     publisher = {mathdoc},
     volume = {62},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1997_62_1_a11/}
}